<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" v-model="num1">
    <input type="text" v-model="num2">
    <input type="button" @click="f('+')" value="+">
    <input type="button" @click="f('-')" value="-">
    <input type="button" @click="f('*')" value="*">
    <input type="button" @click="f('/')" value="/">
    <h1>结果：{{info}}</h1>
</div>


<script src="../js/vue.js"></script>
<script>
    let v = new Vue({
        el: "div",
        data: {
            num1: "",
            num2: "",
            info: ""
        },
        methods: {
            f(x) {
                v.info = eval(v.num1 + x + v.num2)
            }
        }
    })
</script>
</body>
</html>